rcc structures design MCQs – Page 3

Practise focused rcc structures design questions with marked answers for exam preparation and subject revision.

rcc structures design Mcqs

41. The modular ratio m of a concrete whose permissible compressive stress is C, may be obtained from the equation.
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A. m = 2800/3C

B. m = 3500/3C

C. m = 700/3C

D. m = 1400/3C

42. on a circular slab of radius , the maximum radial moment at the centre of the If is the load slab, is WR/16_____________?
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A. t; NON OF THESE

B. 5WR/16

C. 3WR/16

D. 2WR/16

43. longitudinal bars and lateral stirrups, is__________________?
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A. Stress in concrete area of concrete + Stress in steel area of steel

B. None of these

C. Stress in steel area of steel

D. Stress in concrete area of concrete

44. The spacing of transverse reinforcement of column is decided by the following consideration_______________?
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A. Sixteen times the diameter of the smallest longitudinal reinforcing rods in the column

B. Forty-eight times the diameter of transverse reinforcement

C. All the above

D. The least lateral dimension of the column

45. If is the sectional area of a pre-stressed rectangular beam provided with a tendon pre -stressed by a force through its centroidal longitudinal axis, the compressive stress in concrete, is_______________?
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A. A/P

B. P/2A

C. 2A/P

D. P/A

46. The width of the flange of a L-beam, should be less than______________?
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A. One- sixth of the effective span

B. Least of the above

C. Breadth of the rib + four times thickness of the slab

D. Breadth of the rib + half clear distance between ribs

47. Total pressure on the vertical face of a retaining wall of height h acts parallel to free surface and from the base at a distance of_____________________?
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A. h/2

B. h /4

C. h/3

D. 2h/3

48. An R.C.C beam of 25 cm width has a clear span of 5 metres and carries a U.D.L. of 2000 kg/m inclusive of its self weight. If the lever arm of the section is 45 cm., the beam is__________________?
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A. Is safe with stirrups

B. Is safe with stirrups and inclined members

C. Needs revision of the section

D. Safe in shear

49. A pre-stressed concrete member is preferred because___________________?
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A. Removal of cracks in the members due to shrinkage

B. Its dimensions are not decided from the diagonal tensile stress

C. All the above

D. Large size of long beams carrying large shear force need not be adopted

50. As per IS : 456, the reinforcement in a column should not be less than________________?
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A. 0.5% and not more than 5% of cross-sectional area

B. 0.8% and not more than 8% of cross-sectional area

C. 0.6% and not more than 6% of cross-sectional area

D. 0.7% and not more than 7% of cross-sectional area

51. If the permissible compressive and tensile stresses in a singly reinforced beam are 50 kg/cm2 and 1400 kg/cm2 respectively and the modular ratio is 18, the percentage area At of the steel required for an economic section, is__________________?
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A. 0.50%

52. is the pre- stressed force applied to tendon of a rectangular pre-stressed beam whose area of cross section is and sectional modulus is . The minimum stress on the beam subjected to a maximum bending moment is________________?
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A. f = (P/A) (Z/M)

B. f = (P/A) (M/Z)

C. f = (P/A) (M/6Z)

D. f = (A/P) (M/Z)

53. Pick up the incorrect statement from the following: Tensile reinforcement bars of a rectangular beam_______________?
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A. Are bent up at suitable places to serve as shear reinforcement

B. Are bent down at suitable places to serve as shear reinforcement

C. Are curtailed if not required to resist the bending moment

D. Are maintained at bottom to provide at least local bond stress

54. Thickened part of a flat slab over its supporting column, is technically known as_____________?
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A. Drop panel

B. None of these

C. Top of the column

D. Column head

55. If q is the punching shear resistance per unit area a, is the side of a square footing for a column of side b, carrying a weight W including the weight of the footing, the depth D. of the footing from punching shear consideration, is____________________?
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A. D = W (a b)/4abq

56. An R.C.C. lintel is spanning an opening of 2 m span in a brick wall. The height of the roof is 2.9 m above the floor level and that of the opening is 2.1 m above the floor level. The lintel is to be designed for self weight plus_______________?
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A. UDL of wall

B. UDL of wall + load from the roof

C. Triangular load + load from the roof

D. Triangular load of the wall

57. Side face reinforcement shall be provided in the beam when depth of the web in a beam exceeds_____________?
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A. 120 cm

B. 100 cm

C. 50 cm

D. 75 cm

58. For M 150 grade concrete (1:2:4) the moment of resistance factor is_________________?
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A. 8.50

B. 5.8

C. 7.5

D. 0.87

59. A very comfortable type of stairs is_______________?
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A. Dog legged

B. Straight

C. Open newel

D. Geometrical

60. For a ribbed slab______________?
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A. Width of the rib shall not be less than 7.5 cm

B. Clear spacing between ribs shall not be greater than 4.5 cm

C. Overall depth of the slab shall not exceed four times the breadth of the rib

D. All the above

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